Description:
When running LibreOffice 6.0.4.2, Build ID 9b0d9b32d5dcda91d2f1a96dc04c645c450872bf, installed from Flathub on Fedora 28, Edit with External Tool does not work.

Steps to Reproduce:
1. Open a new Draw drawing
2. Insert → Image, choose one
3. Right-click the image, choose Edit with External Tool


Actual Results:  
Expected results: an external tool opens.

Expected Results:

Actual results: nothing appears to happen, but my laptop fans start up. strace shows the following, looping endlessly:

access("/tmp/vCsUNa.jpg", F_OK)         = 0
lstat("/tmp/vCsUNa.jpg", {st_mode=S_IFREG|0600, st_size=472210, ...}) = 0
poll([{fd=9, events=POLLIN}, {fd=13, events=POLLIN}, {fd=19, events=POLLIN}, {fd=21, events=POLLIN}], 4, 0) = 0 (Timeout)
access("/tmp/vCsUNa.jpg", F_OK)         = 0
lstat("/tmp/vCsUNa.jpg", {st_mode=S_IFREG|0600, st_size=472210, ...}) = 0
poll([{fd=9, events=POLLIN}, {fd=13, events=POLLIN}, {fd=19, events=POLLIN}, {fd=21, events=POLLIN}], 4, 0) = 0 (Timeout)

LibreOffice is still responsive to input.


Reproducible: Always


User Profile Reset: Yes



Additional Info:


User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:61.0) Gecko/20100101 Firefox/61.0