Fixed triggering mode change when acquiring

todo.md

@@ -0,0 +1,8 @@
+1. better time window management:
+
+- instead of a drop down simple combo should be an advanced sub menu with text input + unit selector (us,ms,s,min) + two button to increase / decrease (factor 10 each time)
+- when `timewindow x sample rate x sample size` is greater than `buffer size` apply downsampling of input signals with low pass filter to match the correct freq: e.g. downsample at 100kSps -> low pass filter at 50kHz
+
+2. improve layout management: instead of a fix number of figure, in the menu add a layout editor option, user can add and remove rows ([x] close to the top left of the row to remove, [+] in the top center and bottom center to add new one [above] and [below])
+3. improve plot font rendering and line rendering
+4. improve plot performances with large data (e.g. at 10MSamples the plot start to be laggy)