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openSUSE Tumbleweed using LXQt desktop

I have two displays (1920x1080) arranged one above the other (slight horizontal
variation too) and when pcmanfm-qt (or dolphin, a few apps) perform certain
functions on my lower display, the window moves to a different location on
screen (in fact warps so title bar is on top display, rest of window is on
lower display where I was working).

Dolphin example:
I would expect for example clicking on a network share of mine (in remote-area
in left-pane) to "Documents" (in the search-for left-pane) to change only the
detail in the right-pane of the dolphin window, not for the position on screen
to adjust vertically up, and put the top of the window on the upper display.

If the window is on the upper display; it performs exactly as expected. This
behavior only occurs on vertically aligned screens like i have (this is mostly
from Lubuntu testing) and on lower display.

Pcmanfm-qt example:
I get the same behavior in pcmanfm-qt when clicking from a device choice in
left-pane (eg. partition of my disk) to a bookmark (documents, music etc) in
left-pane, or clicking on a places in left pane (eg. my $HOME folder, desktop,
trash etc). The window only moves if placed on the lower display and moves
always up so the top of window will be on top display.

If my last click was places->guiverc (my $HOME folder) and then click
places->desktop there will be no movement. If however I click to devices->44g..
(my $HOME partition I suspect) the window will move (as it's a option in a
different part of left-pane). If I drag window back, and click
Bookmarks->Documents left-pane, as it's again a different section of left-pane
of pcmanfm-qt window it'll cause my window to move.


I believe this to be a LXQt (upstream) issue, as it also occurs on Lubuntu
19.04
https://bugs.launchpad.net/ubuntu/+source/lxqt-session/+bug/1804329

My opensuse tumbleweed install is new, (having switched to it from Leap)
I can provide more details if helpful.

Reproducible: Always

Steps to Reproduce:
1. two displays, set default-right display so it's below default-left display
2. open pcmanfm-qt & operate it whilst on top display; no issues
3. drag pcmanfm-qt down to bottom display (what was right display
pre-monitor.settings change) and click from a 'place' choice, to a 'device'
choice and window will move.
4. drag back, click any other option in the same category - no window jumps
5. choose another option in different category (place/device/bookmark in
left-pane) & the window will jump to a new position again with part on 'top'
visible display
Actual Results:  
steps 3 & 5 (clicking on different category in left-pane of pcmanfm-qt) will
cause window to jump to new position, partially on top display, mostly on
bottom display where window was pre-click

Expected Results:  
I don't expect window to move on clicking a different place/device/bookmark
(even if I used a different bookmark/device/place..choice last click)

window should remain in the same position