I've been seeing this from time immemorial, probably since 0.something, both under windows and linux/gtk/qt (though under linux is much more frequent):

when I select an object on the form, sometimes I see a ghost selection (or more than one, see the attached screenshots, first one windows, second one linux/gtk).

This is lazarus 1.8.0/fpc 3.0.4 but, as I said, I saw this with every previous lazarus version.

Bye

Luca Olivetti wrote

I've been seeing this from time immemorial, probably since 0.something, both under windows and linux/gtk/qt (though under linux is much more frequent):

There is an oldish report:
https://bugs.freepascal.org/view.php?id=23741
but I don't remember seeing this problem although I have used many Linux distributions and few Windows versions, too. What can make the difference?
Does it happen only with particular forms or with any form?

Juha

Hi,
 
I can simulate this on Qt in several ways:
1) select two components on different tabs of page control, one of them will be ghost
2) some components can be hidden behind other, it is caused by wrong Z-order, for example TSpeedButton behind enlarged non-transparent TLabel or TStaticText. and probably other ways.
 
BTW, what control is that "Status no valido!" caption? Isn't it the case no.2?  
V.
 
______________________________________________________________

I've been seeing this from time immemorial, probably since 0.something, both under windows and linux/gtk/qt (though under linux is much more frequent):

when I select an object on the form, sometimes I see a ghost selection (or more than one, see the attached screenshots, first one windows, second one linux/gtk).

This is lazarus 1.8.0/fpc 3.0.4 but, as I said, I saw this with every previous lazarus version.

Bye

El 18/02/18 a les 02:41, Vojtěch Čihák via Lazarus ha escrit:

That I think it's a different issue (and, IIRC, I saw that too). In this case it's just a plain form.
As I said, I seen this for a long, long time. Much more often with linux than with windows.
E.g., see the attached screenshot (linux/gtk), I just created a new application and dropped a label on the form. That's all.

It' just a label

Bye

El 18/02/18 a les 01:17, Juha Manninen via Lazarus ha escrit:

I don't know. I'm currently using kubuntu 17.10 and a windows 7 virtual machine, but I've seen it with windows xp and my previous linux distributions (older versions of kubuntu, mageia, mandriva). In any case, I'm not sure the cause it's the same both on windows and linux: in linux it's enough to drop a label on a form, and when I move it the position of the ghost selector diverges from the real one

https://www.youtube.com/watch?v=ZteRShCdkDA

under windows I need a more complex form and the ghost selector moves in sync with the real one.
Notice also how the ghost selector of the string grid is just one point.

https://www.youtube.com/watch?v=EY92B46URZ8

Bye

El 18/02/18 a les 10:24, Luca Olivetti via Lazarus ha escrit:

The plot thickens:

while the ghost selector of a label diverges from the real one, the ghost selector of other controls moves in sync:

https://www.youtube.com/watch?v=wTAKaYIM8_U

Bye

El 18/02/18 a les 10:31, Luca Olivetti via Lazarus ha escrit:

Meanwhile, I compiled the ide with qt5 and it doesn't show the problem, while with gtk, see the link, ouch!. I only selected the "PLANTA OFICINES" label.

https://imgur.com/a/FSt5f

Under windows it would "only" show one ghost selector.

Bye

Juha Manninen wrote

There is an oldish report: https://bugs.freepascal.org/view.php?id=23741

Or even older:
https://bugs.freepascal.org/view.php?id=13062
(But that was on WinMe)

Bart