[Solved] 0.19pre, hidden line style setup do not work

[fc_tofu]

version: FreeCAD_0.19.19510_x64_LP_12.1.2_PY3QT5-WinVS2015
os: win10 x64

Reproduce
1. Preferences>TechDraw>TechDraw Dimensions>Conventions, set "Hidden line Style" as "Dashed".
2. Restart FreeCAD.
3. Nothing changes.

fsc_2020-02-10_181141.jpg (113.6 KiB) Viewed 589 times

It's my first time using this function, maybe its design intention is not what I imagine.

[Syres]

I can confirm that I could change that setting (in a slightly different layout) with build 0.19.19358, using 0.19.19503 it appears to not be reading and writing the parameter correctly. As a workaround, in Tools, Edit Parameters, expand BaseApp\Preferences\Mod\Techdraw\General and find HiddenLine in the right pane and change the integer to 2 in your case. Now your hidden lines should be the correctly represented.
I'll have to leave the proper fix to the C++ gurus.

OS: Windows 7 SP 1 (6.1)
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.19.19503 (Git)
Build type: Release
Branch: master
Hash: bb189d540cb958e63af44347a244188fae217e93
Python version: 3.6.8
Qt version: 5.12.1
Coin version: 4.0.0a
OCC version: 7.3.0
Locale: English/United Kingdom (en_GB)

Edit: Simpler workaround

[wandererfan]

It's my first time using this function, maybe its design intention is not what I imagine.

Confirmed. Cut & paste can be an evil thing. Fix soon.

[fc_tofu]

Your workaround works on my machine, thanks.

fsc_2020-02-11_000807.jpg (15.31 KiB) Viewed 540 times

[wandererfan]

1. Preferences>TechDraw>TechDraw Dimensions>Conventions, set "Hidden line Style" as "Dashed".
2. Restart FreeCAD.
3. Nothing changes.

Should be fixed by git commit b4943c1f08

[fc_tofu]

1. Preferences>TechDraw>TechDraw Dimensions>Conventions, set "Hidden line Style" as "Dashed".
2. Restart FreeCAD.
3. Nothing changes.

Should be fixed by git commit b4943c1f08

In recent build, this bug is removed:
FreeCAD_0.19.19697_x64_Conda_Py3QT5-WinVS2015