ui: the trigger panel's frame is a .ui file
The panel's shape -- the heading, one labelled row per setting, the two buttons that run it, and the search block -- now lives in src/ui/trigger-panel.ui. Every control that carries a value stays in code and is appended into the file's row: a dropdown's model and a spin's range are the application's, a label is text a translator owns, so that is where the line runs. `row_for()` is `labeled_box()`'s arrangement with the labels moved into the file; the thirteen old calls to `labeled_box()` here are gone and its eleven uses elsewhere are untouched. `sync_trigger_rows()` now guards the rows it shows and hides, because a row that comes from the file can be missing rather than merely misnamed. The frame is read back by a new dump line: trigger panel: boxes=13 controls_inside=13/13 search_widgets=4/4 search_inside=4/4 where `controls_inside` is what a drifted id breaks -- a control built and never placed leaves the panel with a field missing and nothing else complaining -- and `[defaults] trigger: 0.001 0.002 0 0.001 0 50 0.01` still reads the seven spins in the same tree order, which is the check that the restructure kept the panel's contents. Two days of grief came out of one GTK fact, now in the invariants: an expander's child is not in the widget-parent chain (`gtk_widget_get_parent()` is NULL for it even after the window is presented, while `gtk_expander_get_child()` returns it), so the probe walk had to start there instead of at the panel. The throwaway program that settled it is what stopped the workaround -- a second root in the file plus a code attach -- from being the answer.
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<?xml version="1.0" encoding="UTF-8"?>
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<!-- SPDX-License-Identifier: MIT -->
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<!-- SPDX-FileCopyrightText: 2026 Martino Ferrari -->
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<!--
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The trigger panel's frame: the heading, one labelled row per setting, the two buttons that run it, and
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the search block.
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Every row here is a label and a place for a control, and the control itself is built in code. A
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dropdown's model and a spin button's range are the *application's* (the condition list, the level
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range that follows the channel's scale), while a label is text a translator owns, so the split runs
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between them: the row is the file's and the control is appended into it. That is the arrangement
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`labeled_box()` used to make in code, with the label moved where all the other labels are.
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Between the controls, the labels and the search block are what "read the panel" means, so they are
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here: which of these rows `sync_trigger_rows()` shows depends on the condition (a pulse width has a
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width, a window has two levels, a dropout has a timeout), and that is the code's decision, not this
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file's — this file just has to have a row for each of them to show or hide.
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-->
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<interface>
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<object class="GtkBox" id="trigger_panel">
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<property name="orientation">vertical</property>
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<property name="spacing">6</property>
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<property name="margin-top">8</property>
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<property name="margin-bottom">8</property>
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<property name="margin-start">8</property>
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<property name="margin-end">8</property>
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<child>
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<object class="GtkLabel" id="trigger_heading">
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<property name="label" translatable="yes">Trigger</property>
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<property name="halign">start</property>
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</object>
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</child>
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<child>
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<object class="GtkBox" id="signal_row">
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<property name="orientation">horizontal</property>
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<property name="spacing">6</property>
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<child>
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<object class="GtkLabel">
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<property name="label" translatable="yes">signal</property>
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<property name="halign">start</property>
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</object>
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</child>
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</object>
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</child>
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<child>
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<object class="GtkBox" id="condition_row">
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<property name="orientation">horizontal</property>
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<property name="spacing">6</property>
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<child>
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<object class="GtkLabel">
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<property name="label" translatable="yes">condition</property>
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<property name="halign">start</property>
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</object>
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</child>
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</object>
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</child>
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<child>
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<object class="GtkBox" id="edge_row">
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<property name="orientation">horizontal</property>
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<property name="spacing">6</property>
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<child>
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<object class="GtkLabel">
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<property name="label" translatable="yes">edge</property>
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<property name="halign">start</property>
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</object>
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</child>
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</object>
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</child>
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<child>
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<object class="GtkBox" id="cmp_row">
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<property name="orientation">horizontal</property>
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<property name="spacing">6</property>
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<child>
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<object class="GtkLabel">
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<property name="label" translatable="yes">width is</property>
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<property name="halign">start</property>
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</object>
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</child>
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</object>
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</child>
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<child>
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<object class="GtkBox" id="width_row">
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<property name="orientation">horizontal</property>
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<property name="spacing">6</property>
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<child>
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<object class="GtkLabel">
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<property name="label" translatable="yes">width s</property>
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<property name="halign">start</property>
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</object>
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</child>
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</object>
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</child>
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<child>
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<object class="GtkBox" id="width2_row">
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<property name="orientation">horizontal</property>
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<property name="spacing">6</property>
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<child>
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<object class="GtkLabel">
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<property name="label" translatable="yes">and s</property>
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<property name="halign">start</property>
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</object>
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</child>
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</object>
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</child>
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<child>
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<object class="GtkBox" id="level2_row">
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<property name="orientation">horizontal</property>
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<property name="spacing">6</property>
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<child>
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<object class="GtkLabel">
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<property name="label" translatable="yes">to level</property>
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<property name="halign">start</property>
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</object>
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</child>
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</object>
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</child>
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<child>
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<object class="GtkBox" id="timeout_row">
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<property name="orientation">horizontal</property>
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<property name="spacing">6</property>
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<child>
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<object class="GtkLabel">
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<property name="label" translatable="yes">timeout s</property>
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<property name="halign">start</property>
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</object>
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</child>
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</object>
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</child>
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<child>
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<object class="GtkBox" id="level_row">
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<property name="orientation">horizontal</property>
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<property name="spacing">6</property>
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<child>
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<object class="GtkLabel">
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<property name="label" translatable="yes">level</property>
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<property name="halign">start</property>
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</object>
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</child>
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</object>
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</child>
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<child>
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<object class="GtkBox" id="pre_row">
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<property name="orientation">horizontal</property>
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<property name="spacing">6</property>
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<child>
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<object class="GtkLabel">
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<property name="label" translatable="yes">pre-trigger %</property>
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<property name="halign">start</property>
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</object>
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</child>
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</object>
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</child>
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<child>
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<object class="GtkBox" id="holdoff_row">
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<property name="orientation">horizontal</property>
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<property name="spacing">6</property>
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<child>
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<object class="GtkLabel">
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<property name="label" translatable="yes">hold-off s</property>
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<property name="halign">start</property>
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</object>
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</child>
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</object>
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</child>
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<child>
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<object class="GtkBox" id="mode_row">
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<property name="orientation">horizontal</property>
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<property name="spacing">6</property>
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<child>
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<object class="GtkLabel">
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<property name="label" translatable="yes">mode</property>
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<property name="halign">start</property>
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</object>
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</child>
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</object>
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</child>
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<child>
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<object class="GtkBox" id="record_row">
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<property name="orientation">horizontal</property>
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<property name="spacing">6</property>
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<child>
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<object class="GtkLabel" id="record_label">
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<property name="label" translatable="yes">record events</property>
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<property name="halign">start</property>
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<property name="hexpand">1</property>
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</object>
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</child>
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</object>
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</child>
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<child>
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<object class="GtkButton" id="trigger_arm">
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<property name="label" translatable="yes">Arm</property>
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</object>
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</child>
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<child>
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<object class="GtkButton" id="trigger_live">
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<property name="label" translatable="yes">Go live (trigger off)</property>
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<property name="tooltip-text" translatable="yes">disable trigger mode and stream continuously</property>
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</object>
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</child>
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<child>
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<object class="GtkExpander" id="search_exp">
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<property name="label" translatable="yes">Search the buffer</property>
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<property name="tooltip-text" translatable="yes">find every place in the retained buffer where the condition above holds, and step through them</property>
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<property name="child">
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<object class="GtkBox" id="search_sbox">
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<property name="orientation">vertical</property>
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<property name="spacing">4</property>
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<property name="margin-top">4</property>
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<child>
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<object class="GtkBox">
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<property name="orientation">horizontal</property>
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<property name="spacing">6</property>
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<child>
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<object class="GtkButton" id="search_run">
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<property name="label" translatable="yes">Search</property>
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<property name="hexpand">1</property>
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</object>
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</child>
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<child>
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<object class="GtkButton" id="search_cancel">
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<property name="label" translatable="yes">Stop</property>
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<property name="sensitive">0</property>
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</object>
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</child>
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</object>
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</child>
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<child>
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<object class="GtkLabel" id="search_status">
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<property name="label" translatable="yes">not searched</property>
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<property name="halign">start</property>
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<property name="wrap">1</property>
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<property name="css-classes">dim-label</property>
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</object>
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</child>
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<child>
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<object class="GtkBox">
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<property name="orientation">horizontal</property>
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<property name="spacing">6</property>
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<child>
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<object class="GtkButton" id="search_prev">
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<property name="icon-name">go-previous-symbolic</property>
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<property name="tooltip-text" translatable="yes">the previous hit</property>
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<property name="sensitive">0</property>
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</object>
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</child>
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<child>
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<object class="GtkLabel" id="search_pos">
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<property name="label">--</property>
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<property name="hexpand">1</property>
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</object>
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</child>
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<child>
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<object class="GtkButton" id="search_next">
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<property name="icon-name">go-next-symbolic</property>
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<property name="tooltip-text" translatable="yes">the next hit</property>
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<property name="sensitive">0</property>
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</object>
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</child>
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</object>
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</child>
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<child>
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<object class="GtkLabel" id="search_marks">
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<property name="label"> </property>
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<property name="halign">start</property>
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<property name="css-classes">dim-label</property>
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<property name="ellipsize">3</property>
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</object>
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</child>
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</object>
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</property>
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</object>
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</child>
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</object>
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</interface>
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@@ -17,5 +17,6 @@
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<file preprocess="xml-stripblanks">main-window.ui</file>
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<file preprocess="xml-stripblanks">cursors-panel.ui</file>
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<file preprocess="xml-stripblanks">measures-panel.ui</file>
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<file preprocess="xml-stripblanks">trigger-panel.ui</file>
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</gresource>
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</gresources>
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