SHIFT click to select a range doesn't work in Object Inspector

Original Reporter info from Mantis: rvk

• Reporter name: Rik van Kekem

Description:

Selecting multiple components with SHIFT-click (selecting a range) doesn't work anymore from Lazarus 1.8 an higher.

The TTreeView for the Object Inspector has tvoAllowMultiSelect in the options but the MultiSelectStyle only has [msControlSelect] and msShiftSelect is missing from that.

Lazarus 1.6.4 didn't use the msShiftSelect value but 1.8+ does.
The Lazarus IDE needs msShiftSelect in the MultiSelectStyle too.

Steps to reproduce:

Open a new project.
Drop a few TButtons on the form.
Now select the first from the Object Inspector.
Hold the SHIFT and select the last.

Expected behavior (and working in Laz 1.6.4) is that all items are selected.

Mantis conversion info:

• Mantis ID: 33383
• Build: trunk
• Platform: All
• Fixed in version: 1.9 (SVN)
• Fixed in revision: 57497 (#1dc4d93a)
• Target version: 1.8.4