(In reply to Commit Notification from comment #4)
> Caolán McNamara committed a patch related to this issue.
> It has been pushed to "libreoffice-6-3":
> 
> https://git.libreoffice.org/core/+/
> b6ca3a24f78f1deca2ad6d01d667f6a8db5a498c%5E%21
> 
> Resolves: tdf#126005 make bookmark treeview sortable
> 
> It will be available in 6.3.0.1.
> 
> The patch should be included in the daily builds available at
> https://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More
> information about daily builds can be found at:
> https://wiki.documentfoundation.org/Testing_Daily_Builds
> 
> Affected users are encouraged to test the fix and report feedback.

Today I looked up at https://dev-builds.libreoffice.org/daily/master/ but I only found versions of 2019-06-15 for Linux. There were versions of 2019-06-26 for Android, MacOS and Windows, but the one for Linux is missing.

(In reply to Xisco Faulí from comment #5)
> Verified in
> 
> Version: 6.4.0.0.alpha0+
> Build ID: 52800731baf9fcb88e54d60de5585640c8f97f7b
> CPU threads: 4; OS: Linux 4.15; UI render: default; VCL: gtk3; 
> Locale: ca-ES (ca_ES.UTF-8); UI-Language: en-US
> Calc: threaded
> 
> @Caolán, thanks for fixing this issue!!

Where did you get this Linux build? Unfortunately it does not tell the date (which is shown, if one enquires the version in the help). 

I only got the one of 2019-06-15, namely
Version: 6.4.0.0.alpha0+
Build ID: f75c2b04785aa05cff3bcd52689feb7400a14e8e
CPU threads: 4; OS: Linux 4.4; UI render: default; VCL: gtk3; 
TinderBox: Linux-rpm_deb-x86_64@86-TDF, Branch:master, Time: 2019-06-15_11:49:26
Locale: de-DE (de_DE.UTF-8); UI-Language: en-US
Calc: threaded

see my last comment. (Bookmarks can't be sorted in the tree view showing up in Insert>Bookmark or in the navigator in that version)

Today I tried this again in 

Version: 7.2.0.0.alpha1+ / LibreOffice Community
Build ID: e0c4cdf9a874bb40f028a26562e6399d39cb2c0f
CPU threads: 4; OS: Linux 5.4; UI render: default; VCL: gtk3
Locale: de-DE (de_DE.UTF-8); UI: de-DE
TinderBox: Linux-rpm_deb-x86_64@86-TDF, Branch:master, Time: 2021-05-29_20:31:52
Calc: threaded

When trying set a hyperlink to a bookmark the offered list is not ordered to any reasonable order: neither by appearance in the document nor lexicographically.
One can't sort them by any criterium in this dialogue.

When I try to set a hyperlink to a heading, the displayed list prefixes all headings with a hierarchical numbering scheme. In my document I don't use such a scheme, so the beginnings of the written headings (i.e. without this prefixed numbering, which doesn't really help me) for each heading jump line by line from one column to another, which makes finding a specific beginning of them with the eye more difficult.

As I said earlier: There should be a search function (which might be the standard one if it is applied while the Dialogue "Sprungziel im Dokument" (probably Jump target in document in an English version) is open - and then it should only search in that dialogue's window.

(In reply to Adalbert Hanßen from comment #8)
> Today I tried this again in 
> 
> Version: 7.2.0.0.alpha1+ / LibreOffice Community
> Build ID: e0c4cdf9a874bb40f028a26562e6399d39cb2c0f
> CPU threads: 4; OS: Linux 5.4; UI render: default; VCL: gtk3
> Locale: de-DE (de_DE.UTF-8); UI: de-DE
> TinderBox: Linux-rpm_deb-x86_64@86-TDF, Branch:master, Time:
> 2021-05-29_20:31:52
> Calc: threaded

Adalbert, if status of a bug is VERIFIED FIXED and you think, something doesn't work, please open a new bug report and refer to that report. Thank you. In the actual case there seem to be bug 123514.