Very annoying problem

[Leon Pollak]

Thank you, René.

I am debugging the embedded application via TCP connection under Fedora 28+KDE 
- I am in doubts that there is something more standard than that...:-)

In the systemsettings part "Desktop effects" everything is off (unchecked). I 
hate all these effects...:-)

The compositor was ON - I switched it OFF but no influence observed.
I also tried all possible variants of settings in "Compositor Settings for 
Desktop Effects" - no influence.

Please, note that:
1. This issue appears ONLY in Kdevelop and ONLY in switching from code to 
debug.
2. The first second shows the GDB pane correctly, but then it is "substituted" 
with the same down pane from the code view - "Build" pane.
I don't know what does this mean, may be....


On Wednesday, 27 March 2019 11:44:55 IST René J.V. Bertin wrote:
> On Wednesday March 27 2019 11:10:55 Leon Pollak wrote:
> >To be more precise - when the screen switches everything looks OK for the
> >first second, may be two. Then something springs out and this screen part
> >displays the previous fragment.
> >If I switch to another application (mc in example) and return - this part
> >of mc screen remains.
> 
> I think the symptoms are not directly related to KDevelop. I see something
> like what you describe from time to time when I switch desktops and am
> using a simpler window manager than KWin (xfwm4). Parts of the display are
> not being updated and this has to do somehow with the compositor (= the
> component responsible for more fancy GUI things; effects, transparency
> etc).
> 
> Of course the window manager (and thus the compositor) is independent from
> KDevelop and should not be affected by what you're doing in KDevelop. The
> only things I can think of that could explain (supposing you're using X11
> and not Wayland of which I know nothing!):
> 
> - you're trying to debug the window manager. That'd be a very bad idea so
> I'm pretty certain you're not doing that - your application does fancy
> (OpenGL) things itself, or you have a lot of UI effects configured, and you
> interrupt the application in the middle of doing such things. A bit like
> when you trigger a breakpoint in a location that does something with a
> popup or modal dialog which is already open; you're stuck because the
> application had grabbed mouse and keyboard so you cannot control the
> debugger and the application is paused.
> 
> If you are using KWin (= you run a standard KDE Plasma desktop environment)
> then you can turn off the compositor and UI effects via the systemsettings.
> There's also a hotkey for toggling it. You could try that, preferably
> before you start debugging.
> 
> R.


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