- focus first checkbox on form designer
- call OI, rename (using Name field) check from chkPlus to chkShowPlus, press Enter
- OI's top combobox (list of objects) still shows "chkPlus" (and dropdown list too)
If you are sure that this is a bug of the LCL or the Object Inspector you must demonstrate the problem with LCL-only components. No one is going to look at a third-party component which can have its own bugs.
It took me some time to find out that you turned off the component tree in the object inspector; otherwise that top combobox which is outlined in brown/orange color in your screenshot is not shown.
Yes, in this mode of operation I can confirm that the name of the renamed component is not updated correctly. This is not only a gtk2 and 64bit issue, it also happens on Windows and 32 bit Laz. In Laz 1.6.4, the behavior still was correct. I don't have the old RCs of Laz 1.8, but the issue is seen at least after RC3 (in trunk, as well). Therefore, I changed the title to emphasize that this is a regression.
In the component tree which is displayed by default the component name is updated correctly.