Confused file navigation of Plugin Editor

[t-mug]

• Dropdown list "forgets" the selected plugin name while opening another file from the list and jumps always back to the first list item.

• While loading a file from a plugin list into the editor the list file name jumps to the top of the list unexpectedly.

• Sometimes (no obvious reasons) opening a file leads to "loosing" files from the plugin list.

Initial report: ​http://wordpress.org/support/topic/plugin-editor-navigation-confused

This bug is remaining after v.3.4.2 and will probably not be resolved in version 3.5.

[helenyhou]

Seems like a duplicate of some other tickets - #22634, #17552, probably others.

[SergeyBiryukov]

Duplicate of #22634.