[Konsole-devel] [Bug 223302] New: konsole does not clear lower parts of window properly after xrandr resizes without redraw in between

[Sami Liedes]

https://bugs.kde.org/show_bug.cgi?id=223302

           Summary: konsole does not clear lower parts of window properly
                    after xrandr resizes without redraw in between
           Product: konsole
           Version: unspecified
          Platform: Debian testing
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: konsole-devel at kde.org
        ReportedBy: sliedes at cc.hut.fi


Version:            (using KDE 4.3.4)
OS:                Linux
Installed from:    Debian testing/unstable Packages

Architecture is amd64.

How to reproduce:
=================

1. Start konsole
2. Do something to get enough output that the entire konsole window is
vertically filled (i.e. the cursor is on the last line of the konsole and
there's non-blank output on lines before it; e.g. ls -la in your home directory
until enough output)
3. Switch to a different virtual desktop. This seems to be significant. (or
minimize konsole, that's sufficient too.)
4. Use xrandr on another konsole window to switch to a *lower* resolution. For
example, xrandr -s 800x600 (use xrandr without options to list supported
resolutions). Or use a gui tool to lower the resolution.
5. Use xrandr to switch back to the original resolution (on the same konsole
you used to switch to lower resolution). Do NOT switch back to the original
virtual desktop between steps 4 and 5.
6. Switch back to the desktop with the konsole window opened in step 1 (or
bring minimized konsole back)

Result:
=======

The konsole window shows the output generated by e.g. ls -la in the bottom
part, but the prompt is in the middle. Viz:

+-----------------------------
| output line 1          }
| output line 2          } the number of lines visible in 800x600
| output line 3          } (here 3)
| prompt$ [rest of line blank]
| output line 5
| output line 6
| ...
+------------------------------

where lines starting from 5 are ls -la output which would not have been visible
in the lower resolution.

Furthermore, running the command "clear" results in the following:

+-----------------------------
| prompt$ [rest of line blank]
| 
| 
| 
| output line 5
| output line 6
| ...
+------------------------------

Expected results:
=================

Either

1a. Lines starting from 5 are blank after step 6

OR

1b. (arguably preferable, but probably quite a bit harder to implement) The
konsole window after step 6 is as if no xrandr resizes had ever happened. I
guess this would need not notifying Konsole of the resize at xrandr command
time when it's not visible, but only when it becomes visible (here at step 6)
iff its size has changed from what it was when it was previously visible (so
here it would not get such a notification at all).

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