docs: the readouts strip follows the collapsed state

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

docs/claude/probe-readings.md

@@ -1845,20 +1845,21 @@ These ride on the `[cursors-probe]` readings (every state line gets a `dock curs
 ## `strip:` (the readouts strip)
 
 ```
-[cursors-probe]  <what> strip: visible=0 dock_shown=1 cursors=4 measures=0  same_text=1 h=0  sens_same=1 collapsed=1 window=756
-[measures-probe] <what> strip: visible=0 dock_shown=1 cursors=0 measures=12 same_text=1 h=0  sens_same=1 collapsed=1 window=756
-[cursors-probe]  dock hidden strip: visible=1 dock_shown=0 cursors=4 measures=0 same_text=1 h=26 sens_same=1 ...
-[cursors-probe]  dock restored strip: visible=0 dock_shown=1 ...
+[cursors-probe]  <what> strip: visible=1 expected=1 visible_ok=1 dock_shown=1 cursors=4 measures=0 same_text=1 h=26 sens_same=1 collapsed=1 window=756
+[measures-probe] <what> strip: visible=1 expected=1 visible_ok=1 dock_shown=1 cursors=0 measures=12 same_text=1 h=26 sens_same=1 collapsed=1 window=756
+[cursors-probe]  dock hidden strip: visible=1 expected=1 visible_ok=1 dock_shown=0 cursors=4 measures=0 same_text=1 h=26 sens_same=1 ...
+[cursors-probe]  dock restored strip: visible=1 expected=1 visible_ok=1 dock_shown=1 ... collapsed=1 window=756
 ```
 
 One `strip:` line follows every `dock cursors:` / `dock measures:` line, and each probe ends with a drive that puts the dock away through the wish (`sidebar_wanted = false`), reads the strip 600 ms later (`dock hidden`), restores the wish and reads again (`dock restored`).
 
-- **`visible` is the opposite of `dock_shown`** (`dock_shown` is `show-sidebar`) on every settled line. `visible=0 dock_shown=0` or `visible=1 dock_shown=1` is `sync_readouts_strip()` not run (or run before the reconciliation); a single such line right after the probe's own `update_side_visibility()` is the sub-frame before the next tick and not a defect.
+- **`visible` equals `expected`, and `expected = !dock_shown || collapsed`** (`dock_shown` is `show-sidebar`, `collapsed` the split view's, both read in the same frame as `visible`). `visible_ok=1` is that equality; `visible_ok=0` is `sync_readouts_strip()` not run, or run before the reconciliation. A single such line right after the probe's own `update_side_visibility()` or on the very first line (the tick has not set `collapsed` yet) is the sub-frame before the next tick and not a defect.
+- **`visible=1 expected=1` on every line under `xvfb-run`**, the `dock restored` line and the lines with `dock_shown=1` included: the window is 756 px, below the 900 px `kSidebarRoom`, so the split view is collapsed, the dock is an overlay on the plot, and the strip stays. `visible=0` there is the old rule (hidden whenever the dock is shown) or `collapsed` not being read. The wide case (`collapsed=0`, `dock_shown=1`, `visible=0 expected=0`) is **not reachable from a probe**, because a window with no manager cannot be resized by `gtk_window_set_default_size()`.
 - **`h` is 26 with `visible=1`, 0 with `visible=0`.** Any other visible height is the chips setting the strip's height (the button trim in `ui_widgets.cpp` or the `height-request` lost).
 - **`same_text=1` is the assertion**: every strip label (the cursors' `who` and delta, the measurements' values) has the dock's text, and the counts of chips match the dock's lines. `0` is a value written to one view only -- a dock cell set without `dock_cursor_cell()` / `dock_measure_value()`, or a rebuild that did not mirror.
 - **`cursors` / `measures`** are the chip counts and equal the dock's `lines`.
 - **`sens_same=1`**: the strip's cursor chips and the dock's cursor grid have the same sensitivity (`dock_set_cursors_sensitive()`).
-- **`collapsed=1 window=756`** on every line under `xvfb-run`: the window is below the 900 px `kSidebarRoom`, so these lines are all the *collapsed* case (a wished dock stays overlaid, `visible=0`; a hidden one shows the strip). The non-collapsed case is not reachable from a probe, because a window with no manager cannot be resized by `gtk_window_set_default_size()`. The very first line can read `collapsed=0` (the tick has not set it yet).
+- **`collapsed=1 window=756`** on every line under `xvfb-run`; the very first line can read `collapsed=0` (the tick has not set it yet), and then `expected` follows it.
 
 ## `[sidebar-probe]`