All controls in the dialog have borders except the thumbnail view control, so a 1px border is needed to separate the dialog background color from the thumbnail view background color.
Setting to NEW.
Akshay Deep committed a patch related to this issue. It has been pushed to "master": http://cgit.freedesktop.org/libreoffice/core/commit/?id=9abc547ef28f3f6891030597fd304ca757b102da tdf#101870 - Template manager thumbnail view control needs a border It will be available in 5.4.0. The patch should be included in the daily builds available at http://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More information about daily builds can be found at: http://wiki.documentfoundation.org/Testing_Daily_Builds Affected users are encouraged to test the fix and report feedback.
Akshay Deep committed a patch related to this issue. It has been pushed to "libreoffice-5-3": http://cgit.freedesktop.org/libreoffice/core/commit/?id=e4a8b60564cdc332b07f3e18a67416b3c5c48703&h=libreoffice-5-3 tdf#101870 - Template manager thumbnail view control needs a border It will be available in 5.3.0.1. The patch should be included in the daily builds available at http://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More information about daily builds can be found at: http://wiki.documentfoundation.org/Testing_Daily_Builds Affected users are encouraged to test the fix and report feedback.
Version: 5.3.0.0.beta1+ Build ID: a1f6159db30e2463b118c1571bb01a09356b7c49 CPU Threads: 2; OS Version: Linux 3.19; UI Render: default; VCL: gtk2; Layout Engine: new; TinderBox: Linux-rpm_deb-x86_64@70-TDF, Branch:libreoffice-5-3, Time: 2016-12-08_00:34:06 Locale: en-US (en_US.UTF-8); Calc: group