[Bug 1741767] [NEW] Muon rebuilds search index very often and inefficient

[Norbert]

Public bug reported:

Steps to reproduce:
1. Install Muon on 16.04 LTS and launch it 
2. Click "Check for updates"
3. Wait for "Rebuilding Search Index" to finish
4. After some time open Muon again (without 'apt-get update', 'aptitude update').
5. Get 'Rebuilding search index' message with background process /usr/sbin/update-apt-xapian-index and high CPU load and high temperature as the result.

Expected results:
Muon runs update-apt-xapian-index only when it's really needed. Muon allows user to search packages instantly after launch.

Actual results:
Muon rebuilds search index very often and inefficient. Muon does not allow user to search packages instantly after launch.

Note:
This bug is very similar to the Synaptic one (see https://bugs.launchpad.net/bugs/1685376).
It is caused by problems in apt-xapian-index (mainly https://bugs.launchpad.net/bugs/1612948).

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: muon 4:5.6.0-0ubuntu1.16.04.1
ProcVersionSignature: Ubuntu 4.4.0-104.127-generic 4.4.98
Uname: Linux 4.4.0-104-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.15
Architecture: amd64
CurrentDesktop: MATE
Date: Sun Jan  7 19:20:12 2018
InstallationDate: Installed on 2014-02-07 (1429 days ago)
InstallationMedia: Ubuntu 12.04.4 LTS "Precise Pangolin" - Release amd64 (20140204)
SourcePackage: muon
UpgradeStatus: Upgraded to xenial on 2017-04-15 (266 days ago)

** Affects: muon (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug xenial

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Title:
  Muon rebuilds search index very often and inefficient

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