Issue in Designer usability - Lazarus/Linux/Gnome

[edsontmarques]

How to reproduce the issue

1. Structure: Linux Ubuntu 21.04, 64 bits, with Gnome 3.38.n

2. Using fpcupdeluxe, install Lazarus+FPC trunk (v2.1.0 r64270 at the moment)

3. Still with fpcupdeluxe install the anchordocking module (which also installs sparta_dockedformeditor)

4. Run Lazarus that already starts a new project, pick some visual components from the palette for the form (in the Designer), click on one of the form's components and manually change one of its properties (for example: Width). Then, using the mouse pointer, click on one of the visual components on the form giving focus to it, then, with the mouse buttons released, move the mouse pointer. It is noticed, at this moment, that it appears that the Control key is pressed while the mouse cursor moves, as the object selection rectangle appears under the mouse cursor ... But the Control key is not pressed and no button on the mouse is pressed too

5. This issue can be somewhat sporadic, but it happens with a very large frequency causing the selection and, sometimes, changes of components that you do not want to change

6. A test was performed with manual installation of Lazarus (2.1.0), anchordocking and sparta_dockedformeditor and the issue also happened

7. When uninstalling sparta_dockedformedsitor the issue does not happen