IDE and programs crash on switching to/from Remote Desktop
lazarus / 9-Editor

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CCRDude · 2015-11-23 07:08

I've got a Windows 10 machine with two screens for development.
Lazarus works fine.

A few times a week, I connect from home, using the Windows Remote
Desktop.

When still open, Lazarus shows up, but crashes a few moments later.
Any of my apps I was using while switching to RDP also crashes. Both
IDE and apps crash with this message:


QuoteProject XXX raised exception class 'External: ?'.

In file '.\include\monitor.inc' at line 21:
Result := GetMonitorInfo(Handle, @Info);
Looking into the callstack, this is called because a ChangeBounds is
called on the form (probably because the two machines have different
monitor resolutions).

Without more exception details, I would guess that the monitor handle
changes when switching connections, and the LCL should react to
WM_WTSSESSION_CHANGE by updating the TMonitorList object.

Since RDP is essentially the same as Fast User Switching, and full
support for Fast User Switching is a requirement MS makes for their
(works with..., certified for...) logo programs, this is kind of a
killer bug on Windows for serious software.

I would report to the bug tracker, but the login I had in my password
store is no longer working, and I don't remember the email address I
used there, and the FPC community login doesn't seem to work either.

This is Lazarus 1.4.4, with FPC 3.0.1, build using fpcup on November
17th.